From: Michel Dänzer michel.daenzer@amd.com

And clean up the function comment a little.

Signed-off-by: Michel Dänzer michel.daenzer@amd.com --- drivers/gpu/drm/radeon/r600.c | 13 +++++------ drivers/gpu/drm/radeon/radeon.h | 9 ++------ drivers/gpu/drm/radeon/radeon_asic.c | 44 ++++++++++++++++++------------------ drivers/gpu/drm/radeon/radeon_asic.h | 2 +- drivers/gpu/drm/radeon/radeon_gem.c | 6 ++--- 5 files changed, 34 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index c17ff5d..76e1616 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -4088,16 +4088,15 @@ int r600_debugfs_mc_info_init(struct radeon_device *rdev) }

/** - * r600_ioctl_wait_idle - flush host path cache on wait idle ioctl + * r600_mmio_hdp_flush - flush Host Data Path cache via MMIO * rdev: radeon device structure - * bo: buffer object struct which userspace is waiting for idle * - * Some R6XX/R7XX doesn't seems to take into account HDP flush performed - * through ring buffer, this leads to corruption in rendering, see - * http://bugzilla.kernel.org/show_bug.cgi?id=15186 to avoid this we - * directly perform HDP flush by writing register through MMIO. + * Some R6XX/R7XX don't seem to take into account HDP flushes performed + * through the ring buffer. This leads to corruption in rendering, see + * http://bugzilla.kernel.org/show_bug.cgi?id=15186 . To avoid this, we + * directly perform the HDP flush by writing the register through MMIO. */ -void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo) +void r600_mmio_hdp_flush(struct radeon_device *rdev) { /* r7xx hw bug. write to HDP_DEBUG1 followed by fb read * rather than write to HDP_REG_COHERENCY_FLUSH_CNTL. diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 6695b62..4a76e13 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -1771,13 +1771,8 @@ struct radeon_asic { int (*suspend)(struct radeon_device *rdev); void (*vga_set_state)(struct radeon_device *rdev, bool state); int (*asic_reset)(struct radeon_device *rdev); - /* ioctl hw specific callback. Some hw might want to perform special - * operation on specific ioctl. For instance on wait idle some hw - * might want to perform and HDP flush through MMIO as it seems that - * some R6XX/R7XX hw doesn't take HDP flush into account if programmed - * through ring. - */ - void (*ioctl_wait_idle)(struct radeon_device *rdev, struct radeon_bo *bo); + /* Flush the HDP cache via MMIO */ + void (*mmio_hdp_flush)(struct radeon_device *rdev); /* check if 3D engine is idle */ bool (*gui_idle)(struct radeon_device *rdev); /* wait for mc_idle */ diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c index 34b9aa9..ba8caa7 100644 --- a/drivers/gpu/drm/radeon/radeon_asic.c +++ b/drivers/gpu/drm/radeon/radeon_asic.c @@ -194,7 +194,7 @@ static struct radeon_asic r100_asic = { .resume = &r100_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &r100_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &r100_mc_wait_for_idle, .gart = { @@ -260,7 +260,7 @@ static struct radeon_asic r200_asic = { .resume = &r100_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &r100_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &r100_mc_wait_for_idle, .gart = { @@ -340,7 +340,7 @@ static struct radeon_asic r300_asic = { .resume = &r300_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &r300_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &r300_mc_wait_for_idle, .gart = { @@ -406,7 +406,7 @@ static struct radeon_asic r300_asic_pcie = { .resume = &r300_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &r300_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &r300_mc_wait_for_idle, .gart = { @@ -472,7 +472,7 @@ static struct radeon_asic r420_asic = { .resume = &r420_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &r300_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &r300_mc_wait_for_idle, .gart = { @@ -538,7 +538,7 @@ static struct radeon_asic rs400_asic = { .resume = &rs400_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &r300_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &rs400_mc_wait_for_idle, .gart = { @@ -604,7 +604,7 @@ static struct radeon_asic rs600_asic = { .resume = &rs600_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &rs600_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &rs600_mc_wait_for_idle, .gart = { @@ -672,7 +672,7 @@ static struct radeon_asic rs690_asic = { .resume = &rs690_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &rs600_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &rs690_mc_wait_for_idle, .gart = { @@ -740,7 +740,7 @@ static struct radeon_asic rv515_asic = { .resume = &rv515_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &rs600_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &rv515_mc_wait_for_idle, .gart = { @@ -806,7 +806,7 @@ static struct radeon_asic r520_asic = { .resume = &r520_resume, .vga_set_state = &r100_vga_set_state, .asic_reset = &rs600_asic_reset, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r100_gui_idle, .mc_wait_for_idle = &r520_mc_wait_for_idle, .gart = { @@ -898,7 +898,7 @@ static struct radeon_asic r600_asic = { .resume = &r600_resume, .vga_set_state = &r600_vga_set_state, .asic_reset = &r600_asic_reset, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &r600_mc_wait_for_idle, .get_xclk = &r600_get_xclk, @@ -970,7 +970,7 @@ static struct radeon_asic rv6xx_asic = { .resume = &r600_resume, .vga_set_state = &r600_vga_set_state, .asic_reset = &r600_asic_reset, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &r600_mc_wait_for_idle, .get_xclk = &r600_get_xclk, @@ -1060,7 +1060,7 @@ static struct radeon_asic rs780_asic = { .resume = &r600_resume, .vga_set_state = &r600_vga_set_state, .asic_reset = &r600_asic_reset, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &r600_mc_wait_for_idle, .get_xclk = &r600_get_xclk, @@ -1163,7 +1163,7 @@ static struct radeon_asic rv770_asic = { .resume = &rv770_resume, .asic_reset = &r600_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &r600_mc_wait_for_idle, .get_xclk = &rv770_get_xclk, @@ -1281,7 +1281,7 @@ static struct radeon_asic evergreen_asic = { .resume = &evergreen_resume, .asic_reset = &evergreen_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &rv770_get_xclk, @@ -1373,7 +1373,7 @@ static struct radeon_asic sumo_asic = { .resume = &evergreen_resume, .asic_reset = &evergreen_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &r600_get_xclk, @@ -1464,7 +1464,7 @@ static struct radeon_asic btc_asic = { .resume = &evergreen_resume, .asic_reset = &evergreen_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &rv770_get_xclk, @@ -1599,7 +1599,7 @@ static struct radeon_asic cayman_asic = { .resume = &cayman_resume, .asic_reset = &cayman_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &rv770_get_xclk, @@ -1699,7 +1699,7 @@ static struct radeon_asic trinity_asic = { .resume = &cayman_resume, .asic_reset = &cayman_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &r600_get_xclk, @@ -1829,7 +1829,7 @@ static struct radeon_asic si_asic = { .resume = &si_resume, .asic_reset = &si_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = r600_ioctl_wait_idle, + .mmio_hdp_flush = r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &si_get_xclk, @@ -1987,7 +1987,7 @@ static struct radeon_asic ci_asic = { .resume = &cik_resume, .asic_reset = &cik_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &cik_get_xclk, @@ -2091,7 +2091,7 @@ static struct radeon_asic kv_asic = { .resume = &cik_resume, .asic_reset = &cik_asic_reset, .vga_set_state = &r600_vga_set_state, - .ioctl_wait_idle = NULL, + .mmio_hdp_flush = NULL, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &cik_get_xclk, diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h index f632e31..b8826c6 100644 --- a/drivers/gpu/drm/radeon/radeon_asic.h +++ b/drivers/gpu/drm/radeon/radeon_asic.h @@ -351,7 +351,7 @@ void r600_hpd_fini(struct radeon_device *rdev); bool r600_hpd_sense(struct radeon_device *rdev, enum radeon_hpd_id hpd); void r600_hpd_set_polarity(struct radeon_device *rdev, enum radeon_hpd_id hpd); -extern void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo); +extern void r600_mmio_hdp_flush(struct radeon_device *rdev); extern bool r600_gui_idle(struct radeon_device *rdev); extern void r600_pm_misc(struct radeon_device *rdev); extern void r600_pm_init_profile(struct radeon_device *rdev); diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c index 08756f6..a350cf9 100644 --- a/drivers/gpu/drm/radeon/radeon_gem.c +++ b/drivers/gpu/drm/radeon/radeon_gem.c @@ -366,9 +366,9 @@ int radeon_gem_wait_idle_ioctl(struct drm_device *dev, void *data, } robj = gem_to_radeon_bo(gobj); r = radeon_bo_wait(robj, NULL, false); - /* callback hw specific functions if any */ - if (rdev->asic->ioctl_wait_idle) - robj->rdev->asic->ioctl_wait_idle(rdev, robj); + /* Flush HDP cache via MMIO if necessary */ + if (rdev->asic->mmio_hdp_flush) + robj->rdev->asic->mmio_hdp_flush(rdev); drm_gem_object_unreference_unlocked(gobj); r = radeon_gem_handle_lockup(rdev, r); return r;

From: Michel Dänzer michel.daenzer@amd.com

This ensures the GPU sees all previous CPU writes to VRAM, which makes it safe:

* For userspace to stream data from CPU to GPU via VRAM instead of GTT * For IBs to be stored in VRAM instead of GTT * For ring buffers to be stored in VRAM instead of GTT, if the HPD flush is performed via MMIO

Signed-off-by: Michel Dänzer michel.daenzer@amd.com --- drivers/gpu/drm/radeon/cik.c | 4 ---- drivers/gpu/drm/radeon/r100.c | 20 +++++++++++++++----- drivers/gpu/drm/radeon/radeon.h | 1 + drivers/gpu/drm/radeon/radeon_asic.c | 6 ++++-- drivers/gpu/drm/radeon/radeon_asic.h | 3 ++- drivers/gpu/drm/radeon/radeon_drv.c | 4 +++- drivers/gpu/drm/radeon/radeon_ring.c | 10 ++++++++++ 7 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index 67194a5..a5dfe58 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -3666,8 +3666,6 @@ void cik_fence_gfx_ring_emit(struct radeon_device *rdev, radeon_ring_write(ring, (upper_32_bits(addr) & 0xffff) | DATA_SEL(1) | INT_SEL(2)); radeon_ring_write(ring, fence->seq); radeon_ring_write(ring, 0); - /* HDP flush */ - cik_hdp_flush_cp_ring_emit(rdev, fence->ring); }

/** @@ -3696,8 +3694,6 @@ void cik_fence_compute_ring_emit(struct radeon_device *rdev, radeon_ring_write(ring, upper_32_bits(addr)); radeon_ring_write(ring, fence->seq); radeon_ring_write(ring, 0); - /* HDP flush */ - cik_hdp_flush_cp_ring_emit(rdev, fence->ring); }

bool cik_semaphore_ring_emit(struct radeon_device *rdev, diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 9241b89..e1bed43 100644 --- a/drivers/gpu/drm/radeon/r100.c +++ b/drivers/gpu/drm/radeon/r100.c @@ -837,11 +837,7 @@ void r100_fence_ring_emit(struct radeon_device *rdev, /* Wait until IDLE & CLEAN */ radeon_ring_write(ring, PACKET0(RADEON_WAIT_UNTIL, 0)); radeon_ring_write(ring, RADEON_WAIT_2D_IDLECLEAN | RADEON_WAIT_3D_IDLECLEAN); - radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0)); - radeon_ring_write(ring, rdev->config.r100.hdp_cntl | - RADEON_HDP_READ_BUFFER_INVALIDATE); - radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0)); - radeon_ring_write(ring, rdev->config.r100.hdp_cntl); + r100_ring_hdp_flush(rdev, ring); /* Emit fence sequence & fire IRQ */ radeon_ring_write(ring, PACKET0(rdev->fence_drv[fence->ring].scratch_reg, 0)); radeon_ring_write(ring, fence->seq); @@ -1060,6 +1056,20 @@ void r100_gfx_set_wptr(struct radeon_device *rdev, (void)RREG32(RADEON_CP_RB_WPTR); }

+/** + * r100_ring_hdp_flush - flush Host Data Path via the ring buffer + * rdev: radeon device structure + * ring: ring buffer struct for emitting packets + */ +void r100_ring_hdp_flush(struct radeon_device *rdev, struct radeon_ring *ring) +{ + radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0)); + radeon_ring_write(ring, rdev->config.r100.hdp_cntl | + RADEON_HDP_READ_BUFFER_INVALIDATE); + radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0)); + radeon_ring_write(ring, rdev->config.r100.hdp_cntl); +} + static void r100_cp_load_microcode(struct radeon_device *rdev) { const __be32 *fw_data; diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 4a76e13..bc970b6 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -1748,6 +1748,7 @@ struct radeon_asic_ring { /* command emmit functions */ void (*ib_execute)(struct radeon_device *rdev, struct radeon_ib *ib); void (*emit_fence)(struct radeon_device *rdev, struct radeon_fence *fence); + void (*hdp_flush)(struct radeon_device *rdev, struct radeon_ring *ring); bool (*emit_semaphore)(struct radeon_device *rdev, struct radeon_ring *cp, struct radeon_semaphore *semaphore, bool emit_wait); void (*vm_flush)(struct radeon_device *rdev, int ridx, struct radeon_vm *vm); diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c index ba8caa7..1cb9330 100644 --- a/drivers/gpu/drm/radeon/radeon_asic.c +++ b/drivers/gpu/drm/radeon/radeon_asic.c @@ -185,6 +185,7 @@ static struct radeon_asic_ring r100_gfx_ring = { .get_rptr = &r100_gfx_get_rptr, .get_wptr = &r100_gfx_get_wptr, .set_wptr = &r100_gfx_set_wptr, + .hdp_flush = &r100_ring_hdp_flush, };

static struct radeon_asic r100_asic = { @@ -331,6 +332,7 @@ static struct radeon_asic_ring r300_gfx_ring = { .get_rptr = &r100_gfx_get_rptr, .get_wptr = &r100_gfx_get_wptr, .set_wptr = &r100_gfx_set_wptr, + .hdp_flush = &r100_ring_hdp_flush, };

static struct radeon_asic r300_asic = { @@ -1987,7 +1989,7 @@ static struct radeon_asic ci_asic = { .resume = &cik_resume, .asic_reset = &cik_asic_reset, .vga_set_state = &r600_vga_set_state, - .mmio_hdp_flush = NULL, + .mmio_hdp_flush = &r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &cik_get_xclk, @@ -2091,7 +2093,7 @@ static struct radeon_asic kv_asic = { .resume = &cik_resume, .asic_reset = &cik_asic_reset, .vga_set_state = &r600_vga_set_state, - .mmio_hdp_flush = NULL, + .mmio_hdp_flush = &r600_mmio_hdp_flush, .gui_idle = &r600_gui_idle, .mc_wait_for_idle = &evergreen_mc_wait_for_idle, .get_xclk = &cik_get_xclk, diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h index b8826c6..3cf6be6 100644 --- a/drivers/gpu/drm/radeon/radeon_asic.h +++ b/drivers/gpu/drm/radeon/radeon_asic.h @@ -148,7 +148,8 @@ u32 r100_gfx_get_wptr(struct radeon_device *rdev, struct radeon_ring *ring); void r100_gfx_set_wptr(struct radeon_device *rdev, struct radeon_ring *ring); - +void r100_ring_hdp_flush(struct radeon_device *rdev, + struct radeon_ring *ring); /* * r200,rv250,rs300,rv280 */ diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c index e9e3610..54aa293 100644 --- a/drivers/gpu/drm/radeon/radeon_drv.c +++ b/drivers/gpu/drm/radeon/radeon_drv.c @@ -82,9 +82,11 @@ * 2.38.0 - RADEON_GEM_OP (GET_INITIAL_DOMAIN, SET_INITIAL_DOMAIN), * CIK: 1D and linear tiling modes contain valid PIPE_CONFIG * 2.39.0 - Add INFO query for number of active CUs + * 2.40.0 - Add RADEON_GEM_GTT_WC/UC, flush HDP cache before submitting + * CS to GPU */ #define KMS_DRIVER_MAJOR 2 -#define KMS_DRIVER_MINOR 39 +#define KMS_DRIVER_MINOR 40 #define KMS_DRIVER_PATCHLEVEL 0 int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags); int radeon_driver_unload_kms(struct drm_device *dev); diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c index 20b0e4f..ec27e05 100644 --- a/drivers/gpu/drm/radeon/radeon_ring.c +++ b/drivers/gpu/drm/radeon/radeon_ring.c @@ -445,11 +445,21 @@ int radeon_ring_lock(struct radeon_device *rdev, struct radeon_ring *ring, unsig */ void radeon_ring_commit(struct radeon_device *rdev, struct radeon_ring *ring) { + /* If we are emitting the HDP flush via the ring buffer, we need to + * do it before padding. + */ + if (rdev->asic->ring[ring->idx]->hdp_flush) + rdev->asic->ring[ring->idx]->hdp_flush(rdev, ring); /* We pad to match fetch size */ while (ring->wptr & ring->align_mask) { radeon_ring_write(ring, ring->nop); } mb(); + /* If we are emitting the HDP flush via MMIO, we need to do it after + * all CPU writes to VRAM finished. + */ + if (rdev->asic->mmio_hdp_flush) + rdev->asic->mmio_hdp_flush(rdev); radeon_ring_set_wptr(rdev, ring); }